SystemUI原始碼分析相關文章
Android8.1 SystemUI原始碼分析之 Notification流程
分析之前再貼一下 StatusBar 相關類圖
電池圖示重新整理
從上篇的分析得到電池圖示對應的佈局為 SystemUI\src\com\android\systemui\BatteryMeterView.java
先從構造方法入手
public BatteryMeterView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setOrientation(LinearLayout.HORIZONTAL);
setGravity(Gravity.CENTER_VERTICAL | Gravity.START);
TypedArray atts = context.obtainStyledAttributes(attrs, R.styleable.BatteryMeterView,
defStyle, 0);
final int frameColor = atts.getColor(R.styleable.BatteryMeterView_frameColor,
context.getColor(R.color.meter_background_color));
mDrawable = new BatteryMeterDrawableBase(context, frameColor);
atts.recycle();
mSettingObserver = new SettingObserver(new Handler(context.getMainLooper()));
mSlotBattery = context.getString(
com.android.internal.R.string.status_bar_battery);
mBatteryIconView = new ImageView(context);
mBatteryIconView.setImageDrawable(mDrawable);
final MarginLayoutParams mlp = new MarginLayoutParams(
getResources().getDimensionPixelSize(R.dimen.status_bar_battery_icon_width),
getResources().getDimensionPixelSize(R.dimen.status_bar_battery_icon_height));
mlp.setMargins(0, 0, 0,
getResources().getDimensionPixelOffset(R.dimen.battery_margin_bottom));
addView(mBatteryIconView, mlp);
updateShowPercent();
Context dualToneDarkTheme = new ContextThemeWrapper(context,
Utils.getThemeAttr(context, R.attr.darkIconTheme));
Context dualToneLightTheme = new ContextThemeWrapper(context,
Utils.getThemeAttr(context, R.attr.lightIconTheme));
mDarkModeBackgroundColor = Utils.getColorAttr(dualToneDarkTheme, R.attr.backgroundColor);
mDarkModeFillColor = Utils.getColorAttr(dualToneDarkTheme, R.attr.fillColor);
mLightModeBackgroundColor = Utils.getColorAttr(dualToneLightTheme, R.attr.backgroundColor);
mLightModeFillColor = Utils.getColorAttr(dualToneLightTheme, R.attr.fillColor);
// Init to not dark at all.
onDarkChanged(new Rect(), 0, DarkIconDispatcher.DEFAULT_ICON_TINT);
mUserTracker = new CurrentUserTracker(mContext) {
@Override
public void onUserSwitched(int newUserId) {
mUser = newUserId;
getContext().getContentResolver().unregisterContentObserver(mSettingObserver);
getContext().getContentResolver().registerContentObserver(
Settings.System.getUriFor(SHOW_BATTERY_PERCENT), false, mSettingObserver,
newUserId);
}
};
}先說下 BatteryMeterView 繼承自 LinearLayout，從上面的構造方法可以看出，我們看到的電池圖示是由兩部分組成的，
電量百分比(TextView)和電池等級(ImageView),構造方法主要做了如下幾個操作
- 初始化電池等級icon，對應的drawable為 BatteryMeterDrawableBase，packages\apps\SettingsLib\src\com\android\settingslib\graph\BatteryMeterDrawableBase.java 將電池等級新增到父佈局中
- 設定 Settings.System.SHOW_BATTERY_PERCENT 監聽，當使用者點選了顯示電量百分比開關，則呼叫 updateShowPercent()方法在電池等級前新增電量百分比
- 通過onDarkChanged()設定預設的電池佈局的主題色，當狀態列主題發生改變時，電池佈局會做相應的更換(亮色和暗色切換)
在 PhoneStatusBarView 中新增了DarkReceiver監聽，最終呼叫到 BatteryMeterView 的onDarkChanged()方法
修改百分比的字型顏色和電池等級的畫筆顏色和背景顏色
////// PhoneStatusBarView
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
// Always have Battery meters in the status bar observe the dark/light modes.
Dependency.get(DarkIconDispatcher.class).addDarkReceiver(mBattery);
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
Dependency.get(DarkIconDispatcher.class).removeDarkReceiver(mBattery);
}
/////BatteryMeterView
public void onDarkChanged(Rect area, float darkIntensity, int tint) {
mDarkIntensity = darkIntensity;
float intensity = DarkIconDispatcher.isInArea(area, this) ? darkIntensity : 0;
int foreground = getColorForDarkIntensity(intensity, mLightModeFillColor,
mDarkModeFillColor);
int background = getColorForDarkIntensity(intensity, mLightModeBackgroundColor,
mDarkModeBackgroundColor);
mDrawable.setColors(foreground, background);
setTextColor(foreground);
}BatteryMeterDrawableBase 是一個自定義 Drawable，通過path來繪製電池圖示，感興趣的可自行研究
BatteryMeterView 中新增了電量改變監聽，來看下 onBatteryLevelChanged()
@Override
public void onBatteryLevelChanged(int level, boolean pluggedIn, boolean charging) {
mDrawable.setBatteryLevel(level);
// M: In case battery protection, it stop charging, but still plugged, it will
// also wrongly show the charging icon.
mDrawable.setCharging(pluggedIn && charging);
mLevel = level;
updatePercentText();
setContentDescription(
getContext().getString(charging ? R.string.accessibility_battery_level_charging
: R.string.accessibility_battery_level, level));
}
@Override
public void onPowerSaveChanged(boolean isPowerSave) {
mDrawable.setPowerSave(isPowerSave);
}setBatteryLevel()根據當前 level/100f 計算百分比繪製path，setCharging()是否繪製充電中閃電形狀圖示
電池狀態改變流程
我們都知道電池狀態改變是通過廣播的方式接受的(Intent.ACTION_BATTERY_CHANGED),搜尋找到 BatteryControllerImpl
SystemUI\src\com\android\systemui\statusbar\policy\BatteryControllerImpl.java
@Override
public void onReceive(final Context context, Intent intent) {
final String action = intent.getAction();
if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {
if (mTestmode && !intent.getBooleanExtra("testmode", false)) return;
mHasReceivedBattery = true;
mLevel = (int)(100f
* intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0)
/ intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100));
mPluggedIn = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0) != 0;
final int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS,
BatteryManager.BATTERY_STATUS_UNKNOWN);
mCharged = status == BatteryManager.BATTERY_STATUS_FULL;
mCharging = mCharged || status == BatteryManager.BATTERY_STATUS_CHARGING;
fireBatteryLevelChanged();
}
.......
}
protected void fireBatteryLevelChanged() {
synchronized (mChangeCallbacks) {
final int N = mChangeCallbacks.size();
for (int i = 0; i < N; i++) {
mChangeCallbacks.get(i).onBatteryLevelChanged(mLevel, mPluggedIn, mCharging);
}
}
}收到廣播後通過 fireBatteryLevelChanged() 遍歷回撥監聽，將狀態引數傳送。 BatteryMeterView實現了 BatteryStateChangeCallback,
收到改變監聽 onBatteryLevelChanged()
android系統電池部分的驅動程式，繼承了傳統linux系統下的Power Supply驅動程式架構，Battery驅動程式通過Power Supply驅動程式生成相應的sys檔案系統，
從而向使用者空間提供電池各種屬性的介面，然後遍歷整個資料夾，查詢各個能源供應裝置的各種屬性
Android的Linux 核心中的電池驅動會提供如下sysfs介面給framework：
/sys/class/power_supply/ac/onlineAC 電源連線狀態
/sys/class/power_supply/usb/onlineUSB 電源連線狀態
/sys/class/power_supply/battery/status 充電狀態
/sys/class/power_supply/battery/health 電池狀態
/sys/class/power_supply/battery/present 使用狀態
/sys/class/power_supply/battery/capacity 電池 level
/sys/class/power_supply/battery/batt_vol 電池電壓
/sys/class/power_supply/battery/batt_temp 電池溫度
/sys/class/power_supply/battery/technology 電池技術
當供電裝置的狀態發生變化時，driver會更新這些檔案，然後通過jni中的本地方法 android_server_BatteryService_update 向 java 層傳送資訊。
當監聽到 power_supply 變化的訊息後， nativeUpdate 函式就會重新讀取以上sysfs檔案獲得當前狀態。
而在使用者層則是在 BatteryService.java 中通過廣播的方式將電池相關的屬性上報給上層app使用。
frameworks\base\services\core\java\com\android\server\BatteryService.java
BatteryService 在SystemServer.java 中建立，BatteryService 是在系統啟動的時候就跑起來的，
為電池及充電相關的服務，主要作了如下幾件事情: 監聽 UEvent、讀取sysfs 中的狀態 、發出廣播 Intent.ACTION_BATTERY_CHANGED 通知上層
BatteryService 的 start()中註冊 BatteryListener，當battery配置改變的時候，呼叫 update()
private final class BatteryListener extends IBatteryPropertiesListener.Stub {
@Override public void batteryPropertiesChanged(BatteryProperties props) {
final long identity = Binder.clearCallingIdentity();
try {
BatteryService.this.update(props);
} finally {
Binder.restoreCallingIdentity(identity);
}
}
}
private void update(BatteryProperties props) {
synchronized (mLock) {
if (!mUpdatesStopped) {
mBatteryProps = props;
// Process the new values.
processValuesLocked(false);
} else {
mLastBatteryProps.set(props);
}
}
}
private void processValuesLocked(boolean force) {
boolean logOutlier = false;
long dischargeDuration = 0;
...
sendIntentLocked();
.....
}
//傳送 ACTION_BATTERY_CHANGED 廣播
private void sendIntentLocked() {
// Pack up the values and broadcast them to everyone
final Intent intent = new Intent(Intent.ACTION_BATTERY_CHANGED);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY
| Intent.FLAG_RECEIVER_REPLACE_PENDING);
int icon = getIconLocked(mBatteryProps.batteryLevel);
intent.putExtra(BatteryManager.EXTRA_SEQUENCE, mSequence);
intent.putExtra(BatteryManager.EXTRA_STATUS, mBatteryProps.batteryStatus);
intent.putExtra(BatteryManager.EXTRA_HEALTH, mBatteryProps.batteryHealth);
intent.putExtra(BatteryManager.EXTRA_PRESENT, mBatteryProps.batteryPresent);
intent.putExtra(BatteryManager.EXTRA_LEVEL, mBatteryProps.batteryLevel);
intent.putExtra(BatteryManager.EXTRA_SCALE, BATTERY_SCALE);
intent.putExtra(BatteryManager.EXTRA_ICON_SMALL, icon);
intent.putExtra(BatteryManager.EXTRA_PLUGGED, mPlugType);
intent.putExtra(BatteryManager.EXTRA_VOLTAGE, mBatteryProps.batteryVoltage);
intent.putExtra(BatteryManager.EXTRA_TEMPERATURE, mBatteryProps.batteryTemperature);
intent.putExtra(BatteryManager.EXTRA_TECHNOLOGY, mBatteryProps.batteryTechnology);
intent.putExtra(BatteryManager.EXTRA_INVALID_CHARGER, mInvalidCharger);
intent.putExtra(BatteryManager.EXTRA_MAX_CHARGING_CURRENT, mBatteryProps.maxChargingCurrent);
intent.putExtra(BatteryManager.EXTRA_MAX_CHARGING_VOLTAGE, mBatteryProps.maxChargingVoltage);
intent.putExtra(BatteryManager.EXTRA_CHARGE_COUNTER, mBatteryProps.batteryChargeCounter);
mHandler.post(new Runnable() {
@Override
public void run() {
ActivityManager.broadcastStickyIntent(intent, UserHandle.USER_ALL);
}
});
}讀取電池狀態 cat /sys/class/power_supply/battery/uevent
時鐘圖示重新整理
從 status_bar.xml 中看到時鐘是一個自定義view， com.android.systemui.statusbar.policy.Clock
檢視 Clock 原始碼知道繼承自 TextView，時間內容更新通過setText()，通過監聽如下5種廣播 修改時間顯示
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
if (!mAttached) {
mAttached = true;
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_TIME_TICK);
filter.addAction(Intent.ACTION_TIME_CHANGED);
filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
filter.addAction(Intent.ACTION_USER_SWITCHED);
getContext().registerReceiverAsUser(mIntentReceiver, UserHandle.ALL, filter,
null, Dependency.get(Dependency.TIME_TICK_HANDLER));
Dependency.get(TunerService.class).addTunable(this, CLOCK_SECONDS,
StatusBarIconController.ICON_BLACKLIST);
SysUiServiceProvider.getComponent(getContext(), CommandQueue.class).addCallbacks(this);
if (mShowDark) {
Dependency.get(DarkIconDispatcher.class).addDarkReceiver(this);
}
}
// NOTE: It's safe to do these after registering the receiver since the receiver always runs
// in the main thread, therefore the receiver can't run before this method returns.
// The time zone may have changed while the receiver wasn't registered, so update the Time
mCalendar = Calendar.getInstance(TimeZone.getDefault());
// Make sure we update to the current time
updateClock();
updateShowSeconds();
}可以看到 mIntentReceiver 監聽了5種型別的action
Intent.ACTION_TIME_TICK 時脈頻率，1分鐘一次
Intent.ACTION_TIME_CHANGED 時鐘改變，使用者在設定中修改了設定時間選項
Intent.ACTION_TIMEZONE_CHANGED 時區改變，使用者在設定中修改了選擇時區
Intent.ACTION_CONFIGURATION_CHANGED 系統配置改變，如修改系統語言、系統螢幕方向發生改變
Intent.ACTION_USER_SWITCHED 切換使用者，機主或其它訪客之間切換
我們看到系統設定介面中的 使用24小時制 開關，點選後時間會立馬改變顯示，就是通過傳送 ACTION_TIME_CHANGED 廣播，
攜帶 EXTRA_TIME_PREF_24_HOUR_FORMAT 引數 ，下面是核心程式碼
vendor\mediatek\proprietary\packages\apps\MtkSettings\src\com\android\settings\datetime\TimeFormatPreferenceController.java
private void set24Hour(boolean is24Hour) {
Settings.System.putString(mContext.getContentResolver(),
Settings.System.TIME_12_24,
is24Hour ? HOURS_24 : HOURS_12);
}
private void timeUpdated(boolean is24Hour) {
Intent timeChanged = new Intent(Intent.ACTION_TIME_CHANGED);
int timeFormatPreference =
is24Hour ? Intent.EXTRA_TIME_PREF_VALUE_USE_24_HOUR
: Intent.EXTRA_TIME_PREF_VALUE_USE_12_HOUR;
timeChanged.putExtra(Intent.EXTRA_TIME_PREF_24_HOUR_FORMAT, timeFormatPreference);
mContext.sendBroadcast(timeChanged);
}回到 Clock.java 中，發現 EXTRA_TIME_PREF_24_HOUR_FORMAT 並沒有被用上，繼續深究程式碼
final void updateClock() {
if (mDemoMode) return;
mCalendar.setTimeInMillis(System.currentTimeMillis());
setText(getSmallTime());
setContentDescription(mContentDescriptionFormat.format(mCalendar.getTime()));
}收到廣播最終都會呼叫 updateClock()，可以看到真正設定時間是通過 getSmallTime() 這個核心方法
private final CharSequence getSmallTime() {
Context context = getContext();
boolean is24 = DateFormat.is24HourFormat(context, ActivityManager.getCurrentUser());
LocaleData d = LocaleData.get(context.getResources().getConfiguration().locale);
final char MAGIC1 = '\uEF00';
final char MAGIC2 = '\uEF01';
SimpleDateFormat sdf;
String format = mShowSeconds
? is24 ? d.timeFormat_Hms : d.timeFormat_hms
: is24 ? d.timeFormat_Hm : d.timeFormat_hm;
if (!format.equals(mClockFormatString)) {
mContentDescriptionFormat = new SimpleDateFormat(format);
/*
* Search for an unquoted "a" in the format string, so we can
* add dummy characters around it to let us find it again after
* formatting and change its size.
*/
if (mAmPmStyle != AM_PM_STYLE_NORMAL) {
int a = -1;
boolean quoted = false;
for (int i = 0; i < format.length(); i++) {
char c = format.charAt(i);
if (c == '\'') {
quoted = !quoted;
}
if (!quoted && c == 'a') {
a = i;
break;
}
}
if (a >= 0) {
// Move a back so any whitespace before AM/PM is also in the alternate size.
final int b = a;
while (a > 0 && Character.isWhitespace(format.charAt(a-1))) {
a--;
}
format = format.substring(0, a) + MAGIC1 + format.substring(a, b)
+ "a" + MAGIC2 + format.substring(b + 1);
}
}
mClockFormat = sdf = new SimpleDateFormat(format);
mClockFormatString = format;
} else {
sdf = mClockFormat;
}
String result = sdf.format(mCalendar.getTime());
if (mAmPmStyle != AM_PM_STYLE_NORMAL) {
int magic1 = result.indexOf(MAGIC1);
int magic2 = result.indexOf(MAGIC2);
if (magic1 >= 0 && magic2 > magic1) {
SpannableStringBuilder formatted = new SpannableStringBuilder(result);
if (mAmPmStyle == AM_PM_STYLE_GONE) {
formatted.delete(magic1, magic2+1);
} else {
if (mAmPmStyle == AM_PM_STYLE_SMALL) {
CharacterStyle style = new RelativeSizeSpan(0.7f);
formatted.setSpan(style, magic1, magic2,
Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
}
formatted.delete(magic2, magic2 + 1);
formatted.delete(magic1, magic1 + 1);
}
return formatted;
}
}
return result;
}方法有點長，我們挑主要的分析一下，DateFormat.is24HourFormat() 最終通過讀取 Settings.System.TIME_12_24值，
這個值正好在上面的 TimeFormatPreferenceController 中點選24小時開關是改變，如果這個值為null，則通過獲取本地時間
Local 來獲取當前時間格式，如果等於24則返回true，該方法的原始碼可在AS中點進去檢視，此處就不貼了。
LocaleData 是一個時間格式管理類，在 DateUtils.java 和 SimpleDateFormat.java 中都頻繁使用
接下來獲取到的 format 為 d.timeFormat_Hm， 設定給 SimpleDateFormat(d.timeFormat_Hm)
String result = sdf.format(mCalendar.getTime());就是當前需要顯示的時間，此處還需要做一下格式化
mAmPmStyle 是通過建構函式自定義屬性賦值的，xml中並沒有賦值，取預設值 AM_PM_STYLE_GONE，走這段程式碼
formatted.delete(magic1, magic2+1); 去除多餘的 '\uEF00' 和 '\uEF01'，最終顯示的就是 formatted。
參考文章